Steam-turbine



C. V- KERR.

STEAM TURBINE. APPLICATION men NOV. 5. 1919.

Patented Nov. 29, 1921.

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amen vio a CHARLES V. KERR, OF AURORA, ILLINOIS, ASSIGNOR TO THE AMERIGAN'WELL WORKS, OF AURORA, ILLINOIS, A CORPORATION OF ILLINOIS. V

STEAM-TURBINE.

Specification of Letters Patent.

Patented Nov.'29, 192i Original application, filed September 1, i917, Serial No. 189,320. Divided and this application filed d November 5, 1918.

T0 all whom it may concern: Be it known that 1,, CHARLES V. lines, a citizen of the United States, residing at Aurora, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in Steam-Turbines, of which the following is a specification.

This invention relates to new and useful improvements in elastic fluid turbines and more particularly to the buckets and means for securing the same to the rotor disks and guide rings employed in the multi-cellular compound type asshown for example in my former U. S. Patent No. 1,131,386, dated March 9, 1915, or in my co-pending application Serial No. 189,320 filed September 1, 1917, of'which the present case is a divisional application. 1 The objects of this invention are:- First, to provide "afcomparatively inexpensive rotor and stator construction by the use of stamped metal buckets.

Second, to provide a construction of rotor and stator in which the buckets comprising an element of the invention can be quickly assembled and firmly secured in slotsmachined in elements forming parts of the rotor or stator.

Third, to so construct a rotor or stator in which all the parts can be quickly and cheaply made and at the same time assein bled and firmly put together with a minimum of time and cost and with unskilled labor.

Other objects and advantages of the invention will appear from the detailed description of the. mode of construction and relation of the parts and operation of the invention to be hereinafter given.

The invention consists of structural characteristics and relative arrangements of elements which will be hereinafter more fully and clearly described and particularly poin ed out in the appended claims.

Referring to the drawings, in which similar reference characters indicate the same parts in the several figures Figure 1, is a fragmentary longitudinal. sectional view of one of the stages of a turbine showing the buckets and means for securing the same to the rotor disks and stationary reversing rings or stator.

Fig. 2, is a sectional view of a part of the Serial No. 335,938;

of Fig. 1,

Fig. 3, is a side elevation of a fragment of the peripheral ring attached to the outer ends of the buckets shown inFigs. 1 and 2.

13 1g. 4:, is a plan view of the innersideof the ring shown in Fig.3, and i Fig. 5, is an enlarged perspective view of one of the buckets shown in Figs. 1 and 2.

Referring to the drawings 15, 15, represent two of the series of abutting annular sections which form the several stages of the rnulti-cellular compound turbine, each of which sections 15 is provided with an internal flange 20, forming a diaphragm 24L havmg the nozzle 26 cooperating with the buckets on the rotor member of the turbine.

The rotor or bucket wheel of the turbine in each stage preferably. consists of two rings ordisks 7 1 fixed to and rotatably supported by a shaft, not shown. Each of the'disks 7 1 has on its outer periphery a series of separated slots, 75,. 75.,which may be milled and which are adapted to receive the inner ends of the buckets 71. The slots 75, preferably extend at an angle about 73 to the axis of the turbine, or disk 74, and each slot 75 is adapted to receive the inner projection or tab 72 of a bucket, the lateral edges of the projection or tab 72 being riveted or rolled to secure the buckets in the slots 75. It will be observedthat the buckets 71 are dished and have their edges thinned or reduced to offer less resistance to the flow of the motive I fluid.

The outer ends of the buckets 71 are pro vided with similar projections or tabs 73 as the inner tabs 72 and are adapted to be engaged and seated in slots 77 on the inner periphery of the ring 76, said ring 76 fit ting over the puter ends of the tabs 73 of the buckets 71. The edges of said tabs 73,

are riveted or rolled over. to secure the outer ends of the buckets 71 to the ring 7 6 in the riphery of the inner ring 78 of said reversing bucket is provided with similar slots as the slots 75 of the disk 74 and also oppositely arranged so that the elastic fluid in passingv from one stage of expansion and through the stator or reversing bucket will be properly and eificiently directed to the next succeeding stage of expansion or rotor element of the turbine as Well understood and needs nofurther explanation.

Although I have shown a stage of thetur-- and results pointed out in the statement of invention.

VVhat'I claim is: c I 1. A turbine bucket adapted for stamping from flat sheet metal having a central concave portion, thin lateral edges on said central portion, rounded ends on said central portion, and rectangular projections beyond said rounded ends, said thin edges and said rectangular projections lying in the same plane. a

r 2. A turbine bucketadapted for stamping from flat sheet metal having a concave central portion, thin lateral edges difiering in length on said central portion, rounded ends on said central portion, and rectangular prowith parallel plane sides in-said periphery,

a ring of larger diameter than said central part arranged concentric therewith, a like number of similar slots onthe inner surface or" said ring, and a like number of sheet metal turbine buckets, each having a concave central portion and fiat rectangular ends en gaged insaid slots and secured therein by riveting the edges of said ends.

4. reversing element for, elastic fluid turbines, comprising an outer ringhaving lateral surfaces'adapted for clamping said ring between adjacent annular sections of said turbine, a number of transverse slots with parallel plane sides in the inner edge'cf said ring, an inner ring of similar diameter than said outer ring arranged concentric therewith, a like number of smaller slots in the outer edge of said inner ring, and a like numberof sheet metal turbine buckets, each having a concave central portion and flat rectangular ends, engaged in said slots and secured therein by'riveting the edges of said ends. r

In testimony whereof I aflix m y CHARLES l.

signature.

KERR; 

